Seven Days in the Life of AR Lac

Details Seven Days in the Life of AR Lac Seven Days in the Life of AR Lac

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717505a&link_type=abstract

American Astronomical Society Meeting 207, #175.05; Bulletin of the American Astronomical Society, Vol. 37, p.1445

Astronomy and Astrophysics

Astronomy

Scientific paper

A week-long pointing on the short-period eclipsing RS CVn binary AR Lac (K0IV+G4IV; P=2d) by the Far-Ultraviolet Spectroscopic Explorer was coordinated with groundbased optical Doppler mapping, to provide an unprecedented view of structure, energetics, and dynamics of subcoronal activity, through time-resolved measurements of FUV diagnostics like C III λ 977, O VI λ 1031, and (coronal forbidden line) Fe XVIII λ 974. The observation was carried out over the period 29 November to 7 December 2004, with a total exposure of 225 ks, covering four revolutions of the binary. Three large flares were captured during this period, and numerous smaller ones, mainly on the K subgiant primary. We discuss the appearance of the FUV activity on the surfaces of the two hyperactive companions, with special emphasis on the eclipse intervals.
This work was supported by a FUSE Guest Investigator grant.

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